The audio transport effect works by performing displacement interpolation on input audio spectra, so that pitches in one signal slide to pitches in the other as an interpolation parameter is changed.
To modify the spectra over time, the audio transport algorithm follows the phase-vocoder paradigm [1]}, [2]}, [3]}.
In detail, a sliding short-time Fourier transform (STFT) is applied to both input audio streams, producing complex spectra.
These spectra are interpolated according to the optimal transport map and fed through an
inverse STFT to form the output audio stream.
